Keyhole lock



l the county above mentioned type, of

panying Patented Sept. 22, 1925.

1 UNITED STATES vrinvnnm. Lose, or Los nNGnLEs, crimson-urn, A-ssienon or bun-THIRD- TO nnwann BAILEY AND ONE-THIRD mowILLIAM BATES CATHER, BOTH or LO'S'ANGELES,

CALIFORNIA.

KEYHOLE noon.-

Application filed August 25, i924. senn' ro. 733,9io. i

T all whom. it may concern Be it known that I, WENDELL Lose, a subject of King George of Great Britain and Ireland, residing at Los Angele's, in of Los Angeles and State of California, have invented new and useful Improvements in KeyholeLocks, of which the. following'is a specification.

My invention relates to keyhole locks of the type adapted to be inserted inthe lock keyhole in a door that has been locked, to form a secondary lock for said doorby preventing the insertion of a key or other lock actuating means in the door keyhole. Secondary locks of the above mentioned type heretofore constructed require to be locked in place by means of a key after being inserted in the door keyhole, and are frequently troublesome to insert and lock and necessitate a considerable waste of time.

T The principal object ofmy invention is to provide a keyhole lock that will automatically 'lock itself in position on being 1I1S8Ified in the doorfkeyhole.

A furtherobject of my provide a neat sturdy keyhole lock of the few parts and simple construction that can be readily carried on the person. I r v My invention is illustrated in. the accomdrawings in which:- i .v Figure l is a vertical cross sectional view of a door lock mounted in a door showing my invention in elevation and in operative position in the door keyhole, the door and door lock vbeing broken away.

Figure 2 is a longitudinal vertical sectional view of my complete device showing the action of the automatic locking tongue in dotted lines.

Figure 3 is a sectional view showing my improved keyhole lock unlocked and ready for withdrawal from the keyhole of a door. Figure 4 is a cross sectional View on line H of Figure 1.

Figure 5 is a cross sectional view on line 5-5 of Figure 2; and

Figure 6 is a cross sectional view on line 6-6 of Figure 3.

Figure 7 is a top plan view of my improved keyhole lock.

Referring now more particularly to Figure 1 a wooden door 7 shown broken away is provided with a vertical slot 8 in the invention Yto edge thereof to p'erm't a door lock 9to be mounted therein. The door lock casing walls 10 g and.- 11 frictionall'y "engage the opposing side's12jand-13 offthe slot 8 and maybeheld in place' therein by screws or other suitable means not shown. Each of said lock casing walls (is cut away 14 'and'15,"respectively to formthe ,keyholes though similar shaped keyholes 1'6 "and 17 -which keyholes arein alignmentwithlarger formed in opposing sides of the wooden door'Tto permit the insertion ofthe key in the lock. r

Referring now "ures 2 and 5 which show invention eminore particularly to Figbodied on a keyhole lock of the well known Yale construction. ,A s't ein l8"pr ovided with a free hollow end portion 19 is rotatafbly mounted in a lock cylinder 20 formed integral' with a tumbler casing-21 depending therefrom and prevented from endwise.- movementther'ein by means, ofa'n fannular flange 22 f lar bearing '23 formedin the"outer:end'-o';f said cylinder, anda ring member 2 l swe'a ted *to. the outside of the stem intermediate its "length and engaging the inner end 25 of "said lock cylinder. 7

' "Springactuated lockt'uinblers e slid-able Qpar'a'll el slots" 27 formed in the tumbler casmgg2l normally engage co-actingtum- 28 varying-lengths and sl-ida'ble in corresponding parallel slots 29 in the "stem 18 to prevent rotation thereof and may be brought out of engagement therewith by means of a specially constructed'key 30 inserted in a longitudinal in the stem 18 and opening into the tumbler slots 29; said key is provided with notches 3-2 of varying sizes which notches engage the predetermined co-acting tumblers 28 when the key is inserted in the look so as to bring the tumblers 26 clear of the stem, whereupon the stem may be rotated.

So as to make the keyhole lock automatically lock itself in position when inserted in a door keyhole, 1 form the free end 19 of the stem hollow and secure therein a plate 33 by means of a pivot 34 passed through a hole in the neck 35 thereof and secured at its ends to opposing sides of said hollow stem. Said hollow stem portion is provided with an upper and a lower slot 36 and 37 respectively, to permit the verslot 31 formed p a formed integral with the "outer end of saidstem'engaglngin'an annutrudes through the slot 36 .35 of the plate 33.

formed large enough to tical play of said plate member 33; the upper slot 36 is formed smaller than the lower slot 37 so as to form a shoulder 38 to limit the upward movement of said plate by engaging the edge 39 thereof. A wedge shaped lockingtongue 40 is'formed integral with the upper edge of said plate and prowhen in normal position. A spiral spring 42secured between two plug members 43 and 44 within the hollow end of the stem resiliently holds the plug 44 against the point 45 of the neck 35 of the plate 33 thereby causing the edge 39 of the plate to engage the shoulder 38 and hold the tongue in looking position.

The plug 44 is preferably made as a ball as shown in Figure 2. a Referring now to the operation ofmy device. When the stem 18 is inserted in the keyhole 17 of the door 7 the edge-'46 of the tongue resiliently engages the upper edge 47 ofthe keyhole 15 in thelock casing Wall 11 which depresses the tongue 40 as the stem is advanced in the keyhole (see dotted lines in Figure 2) until the tongue passes the door lock casing wall 11 whereupon it snaps back into locking position because of the removal of the resistance offered by the upper edge of the door lock keyhole and the action of the spiral spring 42 on the neck To prevent the keypassed completely ring member 24 is engage the face of the lock casing wall 11, around the keyhole 15. i

To prevent rotation of the'keyhole lock when in locked position the tumbler casing hole look from being through the keyhole the v 21 is formed with a lug 48forming an exthe locking tension thereof anddisposed on the lower side of the stem andin the same plane as plate 33, said lug is adapted to lodge in the door keyhole when the keyhole lock is in operating position thereby preventing rotation of the keyhole lock. To remove my improved keyhole look from the-keyhole of a door it is necessary'to insert the key 30 in the longitudinal slot 31' so as to actuate the Yale tumbler lock and rotate thestem one-half turn whereupon the tongue is brought in line with the lower part of the door keyhole and the lock may be readily withdrawn. (See Figure Gbviously many changes may be made in 1 my device without departing from the spirit of my. invention and I claim as within the scope of my invention all forms readable on the claims that will be finally allowed on this application.

I claim v '1. In a keyhole lock the combination of a lock cylinder, a stem rotatable in said cylinder, means for controlling the rotation of said stem in said cylinder, said stem pro- Vided with a free hollow end portion, a locking plate pivoted within said hollow end portion and adapted to protrude through a slot formed'in said stem when in locked position and means for resiliently holding said plate in locked position.

2. In a keyhole lock thecombination of a lock cylinder, a stem rotatable in said cylcinder, means for controlling the rotation of Silld' stem 1n said cylinder,

said stem pro-- vided with a free hollow end portion, a looking plate pivoted within said hollow end portion and adapted to protrude through a 'slot formed in said stem when in locked position, a spiral spring disposed between two plugs within said hollow end portion and adapted to resiliently hold one of saidplugs in contact with the neck of said looking plate to resiliently hold said locking plate in locked position and means for preventing the rotation of said cylinder in a door keyhole. I

WENDELL LOGG. 

